Boiler-furnace.



C. G. HENRY. BOILBRFURNAGE. APPLICATION FILED mm: a, 1911.

Patented Sept. '5, 1911.

OOGOOOO COLUMBIA PLANUGRAPH CO.,WA$HINGTON, 0.0:.

UNITED STATES PATENT OFFICE.

CHARLES G. HENRY, 0F CINCINNATI, OHIO.

BOILER-FURNACE.

To all whom it may concern:

Be it known that I, CHARLES G. HENRY, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Uhio, have invented new and useful Improvements in Boiler-Furnaces, of which the following is a specification.

This invention relates to furnaces for boilers, and has for its object to provide an improved construction whereby all of the gases evolved from bituminous coal will be as nearly consumed as possible.

An important object is to provide a construction, whereby, at the same time that the gases are treated for complete combustion, they will be conducted through the furnace and boiler in such a way that the maximum heating efficiency thereof upon the water will be obtained, and the lower side of the boiler protected from undue deterioration from the severe action of the heat.

In furnaces having the object of perfecting the combustion, it has been customary to use means for thoroughly mixing the gases arising from the coal before its complete combustion, whereby they are adapted to burn easily, these gases being mostly in the form of smoke at first. Also, it is a general practice to introduce air into these gases at some point whereby their combustion will be further facilitated.

It is one of the important objects of this invention to thoroughly mix the gases as they leave the fire-box, and to utilize the construction employed for this mixture to heat a supply of air to be later introduced into the gases and to introduce the air at a proper point to effect complete combustion just as the gases begin to enter the fire-tubes of the boiler.

A further object is to provide means for guarding the lower side of the boiler against the direct action of the fire and to direct a portion of the gases into the mixing device. This means is not intended, however, to close off the gases entirely from the lower side of the boiler, but admits a proper quantity thereto. In consequence of this limited action of the fender device, it is a further purpose of the invention to effect the mixture of the air with the gases and complete the combustion at a time and location in the device whereby the gases passing above the fender and through the mixing device may be combined in the final mixture.

Specification of Letters Patent.

Application filed June 6, 1911.

Patented Sept. 5, 1911. Serial No. 631,633.

Other objects and advantages will be apparent from the following description, and from the drawings, in which,

Figure 1 is a longitudinal sectional view of my furnace, Fig. 2 is an elevation looking through the fire-box toward the rear,-Fig. 3 is a rear elevation, Fig. 4 is a horizontal sectional view of the device.

There is illustrated a boil'er 10, having a fire-box 11 at its forward end, the boiler being supported at its forward end by a wall 12, through which the fire-door 13 opens, and at its rear end by the baflle wall 14. The rear side of the firebox is formed by a wall 15, spaced above which there is a shield 16 of fire-brick, the purpose of which will be subsequently indicated, and over the fire-box there is the canopy 17, in the form of a slightly curved are, spaced at its forward edge from the wall 12, and below the boiler 10, being inclined thence downwardly toward its rear edge, which is spaced from and slightly below the forward edge of the shield 16. Thus spaces 17 and 17 are left at the forward and rear edges of the shield respectively, through which the heated gases may rise directly from the fire-box to the lower side of the boiler, as shown. The larger part of the gases, however, are fended by the canopy 17 into the space beneath the shield 16, in which space there are built the mixing and air-heating passages now to be described.

It will be observed that the shield 16 has its forward edge located vertically above the front face of the wall 15, and the wall 15 is extended rearwardly in the form of a platform 18, corresponding in length to the shield 16. Upon the platform there are built a series of undulating or zigzag walls 19, of which there are six, the mutually adjacent portions of which lie in parallel. Zigzag passages are thus formed extending from the fire-box to the rear edge of the platform 18, and alternate passages 21 are closed at their forward ends, whereby air may be admitted at the forward end and passed toward the rear to be heated, as will be described. An air pipe 20 leads upwardly through the wall 15, being provided with branches opening into respective air passages 21 at their forward ends. It will be observed that three of the passages are closed at their forward ends, outwardly of the outermost of which on each side of the furnace there is a passage 22 for heated gases corresponding to those between the air passages. If desired, the sides of the furnace may be made in conformity with the shape of the walls 19, so that gases passingthrough the outermost passages will be kept in close contact with the walls 19 to produce the maximum heating effect. The baflle wall 1 1 is spaced some distance rearwardly of the rear end of the shield 16 and walls 19, the intermediate space serving as a mixing chamber 23 for the air and gases fromthe fire-box passing through the passages 21 and 22 and over the shield 16. After passing the wall 14, the gases are carried through the fire-tubes of the boiler in the customary manner, passing the for ward end thereof and escaping through a suitable vent to a smoke-stack not shown.

In operation, it will be apparent that the gases developed in the fire-box will be thoroughly mixed, both by their passage above the canopy, and by the passage of a large portion thereof through the passages 22, which mixing will at the same time serve to heat the walls inclosing the air passages 20. The tortuous form of the passages causes the heated gases to impinge forcibly against the walls and increases the heating efficiency thereof, at the same time. The draft induced in the furnace will at the same time draw a strong current of air through the passages 20, which air will also be caused to impinge forcibly against the heated walls 19. Upon the exit of the air and gases at the rear end of the passages the air will have been properly heated, and shortly after becoming mixed with the gases themselves, further combustion will take Copies of this patent may be obtained for place. It will be observed that the mixing chamber is so located that this second stage of combustion occurs just before the gases enter the fire-tubes, so that the full effect of increased heat will be manifest Within the boiler.

What is claimed is:

1. A furnace of the class described, comprising a fire-box, a boiler thereover, a plurality of zigzag mixing passages, alternate air-heating passages therebetween, air duct means leading to the last named passages, a shield over the passages spaced below the boiler, and a canopy over the firebox spaced from the boiler, the lower edge being spaced from the shield and slightly therebelow for the purposes described, a mixing chamber, said mixing and air-heating passages leading thereto, and a combustion chamber communicating with the boiler.

2. In a furnace of the class described, the combination with a fire-box, a boiler thereover, a canopy extending across the fire-box spaced from the forward side of the fire-box and from the boiler, said canopy being inclined toward its rear edge, a shield device extending beneath the boiler and spaced from the rear edge of the canopy, and mixing passages beneath the shield for the re ception of gases fended by the canopy theretoward, for the purposes described.

I In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. V

QHAS. G. HENRY. lVitnesses MORTIMER DUNNING, SA MINOR.

five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

